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AT78C1504 Datasheet

  • AT78C1504

  • Controller Miscellaneous - Datasheet Reference

  • 6頁(yè)

  • ETC

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Features
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Preprogrammed for All Current DVD and CD Write Strategies
Five 10-bit DACs for Controlling a Laser Power Amplifier
Separate DVD and CD APC Provided
On-board Bandgap Reference
Timing Programmable by User
Adaptive Pulse Shift
Programmable End Pulses
Serial Interface for Programming Device
Small Die Size Enables Inclusion on OPU
DVD/CD ALPC
AT78C1504
Description
AT78C1504 is a preprogrammed automatic device for controlling the write, read and
erase pulses to a laser diode power amplifier. All of the present DVD and CD write
strategies are provided in the device. Automatic power control (APC) and optimum
power control (OPC) are also included. Though the device is preprogrammed to pro-
vide signal conditioning of the NRZI data stream, it is possible through a serial
interface to adjust pulse timing, width and amplitude. Five DACs are provided to indi-
vidually control the laser diode power amplifier. The device is particularly suited to
controlling the laser diode power amplifiers from Atmel鈥檚 RF Division. Packaging for
inclusion on the PCBA or on the optical pickup unit (OPU) is available.
Figure 1.
DVD System Block Diagram
DRAM
Flash
AT78C1502
Servo
Control
System
Power
Drivers
Sled
AT78C1501
ATAPI I/F
Controller
DBM
ECC
SRAM
ARM7TDMI
Focus
Spindle
AT78C1503
Read
Channel
Laser
AT78C1504
Laser Power
Controller
T08XX
Laser Amp
AT78C1507
Read
Channel Adj.
AT78C1505
Pre-amp
Rev. 2051A鈥揇VD鈥?7/02
1

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